Yes! See my husband and I love love love all the Celtic names and the Arthurian legends (Tristram was one of the knights who fell in love with Isuelt name is sometimes Isolde!)
HOWEVER
in a baby book I found - a really old one it said Tristram: (not to be confused with Tristan): Sorrowful and Tristan had a totally different meaning to Tristram! Isn't that strange?

Yeah, I know, I'm kind of a Round Table nut

Name books can say weird things. They are the same name, just different versions. And I think associations are more important than the actual meaning anyway; Tristan was a cool, romantic, spirited man and Tristram in the book I mentioned was awesome, so two good namesakes. It's not like the name means heartless sadistic baby murderer.

Well, I like the way the name Tristram sounds, but I always think of TristramShandy, and unlike one of the readers above, I would NOT want my kid associated with that pre-post-mod work of literature/a very weird movie. So, because of that and only because of that, I would stay away.